Automatic Gain Control for Sidelink Communications

Abstract

A wireless device may communicate with one or more other wireless devices via a sidelink. Automatic gain control (AGC) may be performed by a receiving wireless device. A symbol in a sidelink transmission may be duplicated for AGC if the sidelink transmission overlaps in time with the beginning of another sidelink transmission.

What is claimed is: 
     
         1 . A method comprising:
 receiving, by a wireless device, one or more configuration parameters indicating a plurality of starting symbols associated with a plurality of signals in a slot;   transmitting or receiving, in the slot, and via a sidelink channel, a first signal of the plurality of signals, the first signal comprising:
 a first starting symbol of the plurality of starting symbols; 
 a duplication of the first starting symbol; 
 a second starting symbol of the plurality of starting symbols, wherein the second starting symbol is a starting symbol of a second signal of the plurality of signals; and 
 a duplication of the second starting symbol. 
   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving, via the sidelink channel, a signal comprising:
 a third starting symbol; 
 a duplication of the third starting symbol; 
 a fourth starting symbol; and 
   a duplication of the fourth starting symbol;   performing, based on a measurement of the duplication of the third starting symbol, a first automatic gain control (AGC) procedure; and   performing, based on a measurement of the duplication of the fourth starting symbol, a second AGC procedure.   
     
     
         3 . The method of  claim 1 , further comprising:
 mapping a transport block (TB) to resource elements of a plurality of symbols in the slot, wherein the plurality of symbols comprises the first starting symbol and the second starting symbol, wherein the duplication of the first starting symbol is immediately preceding the first starting symbol, and wherein the duplication of the second starting symbol is immediately preceding the second starting symbol.   
     
     
         4 . The method of  claim 1 , wherein the receiving the one or more configuration parameters comprises receiving one or more radio resource control (RRC) messages comprising the one or more configuration parameters. 
     
     
         5 . The method of  claim 1 , wherein the plurality of starting symbols are associated with a plurality of listen-before-talk (LBT) opportunities for sidelink transmission in a shared spectrum. 
     
     
         6 . The method of  claim 1 , wherein the transmitting or receiving the first signal comprises transmitting or receiving a transport block via at least one of:
 a physical sidelink shared channel (PSSCH); or   a physical sidelink control channel (PSCCH).   
     
     
         7 . The method of  claim 1 , further comprising performing, for a symbol in the slot that occurs before one of the plurality of starting symbols, a listen-before-talk (LBT) procedure. 
     
     
         8 . The method of  claim 1 , wherein the transmitting or receiving the first signal comprises:
 transmitting, to a second wireless device, the first signal.   
     
     
         9 . The method of  claim 1 , wherein the one or more configuration parameters further indicate an ending symbol for a sidelink transmission occasion in the slot. 
     
     
         10 . The method of  claim 1 , wherein the duplication of the first starting symbol is for automatic gain control (AGC) and the duplication of the second starting symbol is for AGC. 
     
     
         11 . A method comprising:
 receiving, by a first wireless device, from a second wireless device, in a slot, and via a sidelink channel, a first signal of a plurality of signals, the first signal comprising:
 a first starting symbol of a plurality of starting symbols; 
 a duplication of the first starting symbol; 
 a second starting symbol of the plurality of starting symbols, wherein the second starting symbol is a starting symbol of a second signal of the plurality of signals; and 
 a duplication of the second starting symbol; 
   performing, based on a measurement of the duplication of the first starting symbol, a first automatic gain control (AGC) procedure; and   performing, based on a measurement of the duplication of the second starting symbol, a second AGC procedure.   
     
     
         12 . The method of  claim 10 , further comprising:
 receiving one or more configuration parameters indicating the plurality of starting symbols.   
     
     
         13 . The method of  claim 10 , further comprising:
 receiving, from a third wireless device, in the slot and via the sidelink channel, a signal comprising:
 a third starting symbol; and 
 a duplication of the third starting symbol, wherein the duplication of the third starting symbol overlaps in time with the duplication of the second starting symbol, 
   wherein the performing the second AGC procedure is based on a combined measurement comprising the measurement of the duplication of the second starting symbol and a measurement of the duplication of the third starting symbol.   
     
     
         14 . The method of  claim 10 , further comprising:
 mapping a transport block (TB) to resource elements of a plurality of symbols in the slot, wherein the plurality of symbols comprises the first starting symbol and the second starting symbol, wherein the duplication of the first starting symbol is immediately preceding the first starting symbol, and wherein the duplication of the second starting symbol is immediately preceding the second starting symbol.   
     
     
         15 . The method of  claim 10 , wherein the plurality of starting symbols are associated with a plurality of listen-before-talk (LBT) opportunities for sidelink transmission in a shared spectrum. 
     
     
         16 . The method of  claim 10 , wherein the receiving the first signal comprises receiving a transport block via at least one of:
 a physical sidelink shared channel (PSSCH); or   a physical sidelink control channel (PSCCH).   
     
     
         17 . The method of  claim 10 , further comprising:
 performing, for a symbol in the slot that occurs before one of the plurality of starting symbols, a listen-before-talk (LBT) procedure.   
     
     
         18 . A method comprising:
 transmitting, by a base station, one or more configuration parameters indicating a plurality of starting symbols;   receiving an indication of a sidelink transmission comprising:
 a first starting symbol of the plurality of starting symbols; 
 a duplication of the first starting symbol; 
 a second starting symbol of the plurality of starting symbols; and 
 a duplication of the second starting symbol. 
   
     
     
         19 . The method of  claim 17 , wherein the one or more configuration parameters further indicate:
 mapping for a transport block (TB) to resource elements of first symbols of a plurality of symbols in the slot, wherein the plurality of symbols comprises the first starting symbol and the second starting symbol, wherein the duplication of the first starting symbol is immediately preceding the first starting symbol, and wherein the duplication of the second starting symbol is immediately preceding the second starting symbol.   
     
     
         20 . The method of  claim 17 , wherein the transmitting the one or more configuration parameters comprises transmitting one or more radio resource control (RRC) messages comprising the one or more configuration parameters. 
     
     
         21 . The method of  claim 17 , wherein the plurality of starting symbols are associated with a plurality of listen-before-talk (LBT) opportunities for sidelink transmission in a shared spectrum. 
     
     
         22 . The method of  claim 17 , wherein the duplication of the first starting symbol is for automatic gain control (AGC) and the duplication of the second starting symbol is for AGC.